Snubbed truck



L. A. LEHRMAN SNUBBED TRUCK Oct. 25, 1949.

` Filed July 12, 1945 3 Sheets-Sheet 1 ..--./...MWIIN IN VEN TOR. DC)9.@Uj7na/v Oct. 25, 1949. I L. A. LEHRMAN SNUBBED TRUCK 3 Sheets-Sheet2 Filed July 12, 1945 In@Ww Oct. 25, 1949. l.. A. LEHRMAN SNUBBED TRUCKPatented Oct. 25, 1949 SNUBBED TRUCK Leo A. Lehman, Chicago, lll.,assigner to American Steel Foundries, Chica of New Jersey go, lll., acorporation Appummn July 12, 1945, serial No. 604,624 l2o claims. (ci.10s-197) My invention relates to railway car trucks and moreparticularly to a freight car truck utilizing snubbing or frictioncon-trol means for dampening synchronous oscillations of thespringsnormally used to support the bolster from the side frames. v

The general object of my invention is to design such a railway car truckwherein friction means supported 4by the bolster have associatedtherewith suitable control means for insuring substantially constantfrictional bearing of the friction means against the side frame columnsof the truck throughout the life of the friction vise a railway cartruck such as that described l wherein friction shoes may be mounted ineach side of each bolster end, each shoe being in wedge engagement witha bolster wall and in frictional engagement with a side frame column andwherein resilient means may be so associated with the friction shoes asto insure the shoes being maintained with suicient bearing against thecolumns and the bolster wedge surfaces.

In the drawings:

Figure 1 is a fragmentary side elevation of a railway car ytruckembodying my invention, the view being shown partly in section in orderw more clearly illustrate the arrangement of the friction parts. saidsectional view being taken approximately in the longitudinal verticalplane bisecting the side frame as indicated by the line I--I of Figure3, land Figure 2 is a further fragmentary sectional view takenapproximately in the longitudinal vertical plane indicated by the line2-2 of Figure 3.

Figure 3 is a fragmentary top plan view of the car truck shown inFigures 1 and 2, partly in section, .the view being taken approximatelyin the plane indicated by the line 3-3 of Figure 1;

Figures 4, 5 and 6 `are views illustrating my novel friction shoeutilized in the car truck shown in Figures 1, 2 and 3, Figure 4 being atop plan View thereof, Figure 5 a side elevation thereof,

2 I, and Figure 6 a view thereof looking toward the right of the shoe asseen in Figure 5;

Figure 7 is a fragmentary view comparable :to that shown in Figure 1,illustrating a modified form of my invention, said view being shownpartly in section in the longitudinal vertical plane indicated by theline 1-1 of Figure 9, and Figure 8 is a fragmentary sectional view takenin the longitudinal vertical plane indicated by the line 6 -8 of Figure9;

Figure 9 is a fragmentary top plan view of :the car truck shown inFigures 7 and 8, partly in section, said section being takenapproximately in the plane indicated Iby the line 9-9 of Figure 7; and

Figures 10, 11 and 12 are views illustrating the novel form of frictionshoe utilized in the car truck shown in Figures 7., 8 and 9, Figure 10'being a top plan View thereof, Figure 11 being a side elevationthereof, and Figure 12 'a view looking toward the right of the shoe asseen in Figure 11.

In each of the views only one half of the bolster and side framestructures are shown inasmuch as the arrangement is similar at oppositeends and opposite sides of the truck.

Referring first to the modification illustrated in Figures 1 to 6, theside frame is of well-known truss type having the compression member 2,the tension member 4, and .the column 6, the bolster opening 8 receivingthe bolster I0 supported as at I2 from the coil springs diagrammaticallyindicated at I4l I4, said lsprings being positioned l transverse inboardand outboard ribs 26 and 28 (Figure 3) Vdening with said top and bottomwalls a friction shoe pocket 30 at each side of the bolster end, theadjacent side wall being cored away intermedi-ate the webs 26 and 28.The =bol ster is formed with the laterally extending inboard andoutboard guide 1ugs3l and 32 receiving the adjacent column therebetween.

At the inboard and outboard sides of each pocket are formed the ledges34 and 36 merging with the top wall I8 and with the respective in-`board and outboard webs 26 and 28, each ledge having a diagonal surfacesloping upwardly toward the, adjacent column 6 and having complementaryengagement as at 40 with the associated friction shoe, generallydesignated 42.

One of the friction shoes 42 is shown in detail in Figures 4 to 6,inclusive. said shoe comprising a main friction wall," frictionallyengaged as at 46 with the adJacent`columnmounted wear plate 48.Integrally formed with the .main friction wall 44 of the friction shoe42 are-the diagonal and horizontal walls 60 and 52, the diagonal wallA5|!` presenting the spaced wedge faces 54 and 56.y

urged into complementary engagement as at 40 with the diagonal surfacesof the inboard and outeach shoe intermediate the spaced wedge faces 54Extending. outwardly of the diagonal wall 50 of.

and 66 thereof and between the ledges 34 and 36 of the bolster is avertical wall 62 formed on said shoe and bearing as at 64 against thespring plate or seat 66, said spring seat extending longitudinally ofthe bolster in order to afford beary ing for the full length of theresilient pad 63, one face of which may be vulcanized thereto.The'opposite face of the pad 68 may bear against the center rib 24 andvertical expansion of the pad Y may be accommodated by the clearanceafforded Y asat 10 between the pad and the bottom wall .20,

of the bolster as well as the clearance afforded as at 12 above the padand the top wall I8 of the bolster. A portion of the center rib 24 maybe cored away to form therein an opening 14 (Figure 1) to accommodatethe ow of the pad under compression as ywell as to permit distortion ofthe pads at opposite sidesof the centerrib 24 of the bolster so that thepads will bear against each other under conditions of maximum distortionor flow of the resilient material. It will be apparent that the pad 68will be subjected toa certain amount of compression upon assembly of theshoe with the bolster and positioning of the shoe in abutment with theadjacent column. In this arrangement, the pad 60 is under suchcompression as to maintain the friction shoe 42 seated at all timesagainst the spaced ledges 34 and 36 of the bolster and to operativelyurge the shoe upwardly into wedge engagement therewith and at the sametime the pad 68 will constantly urge the friction shoe outwardly andmaintain it in substantially upright position irrespective of anyangling of the bolster permitted within existing tolerances underservice conditions.

It may be noted that the wan e2 or the shoe 42 is formed with an arcuaterecess 16 centrally thereof and extending from top to bottom thereof incomplementary engagement with the central portion of the spring plate 66and is also formed with the plane faces 18 and 80 at op'- posite sidesof the recess 16 in complementary engagement with the lateral ,ends ofthe spring plate 66. whereby the shoe is maintained in a centralposition between the walls 26 and 28 of the pocket by the pad 68 beingplaced in shear to yieldably resist lateral movement of the shoe in thebolster pocket while vertical movement of the shoe will be permitted asthe shoe is moved'diagonally along the ledges of ,the bolster underservice conditions.

Each shoe may have an opening 82 cored horizontally therethrough alignedwith openings in the inboard and outboard walls 26 and 28 of the pocket.for the reception of pin means which may position the shoe in assembledrelationship with the bolster when the shoe has been urged inwardly ofthe pocket whereby clearance andere will-be'vafforded from the adjacentside column to permit the assembly or disassembly of the bolsterwith'the side'jrame. l

In the assemblyof the friction devices with the bolster, the pads 68 maybe inserted in the respective pockets in the sides' of the `bolster andpositioned against the center rib 24 of the bolster. The\ pads 60 maylthen be positioned on the bottom'wall ofthe bolster and the shoesinserted in the bolster pockets with the wedge .faces 54 and 56inengagement with the diagonal surfaces of the wedges. 34 and 36 ofthebolster'and the shoes may thereafter be urged along the latter surfacesto place the pads 60 and 68 under compression until the opening 82 ineach shoe is in alignment .with the openings in the inboard andoutboardwalls of the associated pocket for' the reception of pin means.Inthe' modification illustrated in Figures 'I to v12, inclusive, theside frame structure is similar to that of the modification previouslydescribed, the sideframe comprising the column |02 having the bolsterend |04,supported adjacent thereto by the bolster springs (not shown),said bolster end comprising a pocketv|06 in each side thereof deflned bythe top and bottomvwalls |08 and ||0, the center rib ||2 and thetransverse inboard and outboard walls ||4 and ||6 spaced from the centerrib ||2. Received within each pocket |06 is a friction shoe, generallydesignated H8, and shown in detail in Figures 10, 1l and l2, said shoecomprising the main friction wall|20 in engagement withl the frictionplate |2| xed to the column' |02 'and having angularly arranged walls|22 and |24 vmerging with the wall |20, said wall |22 havingspaced Wedgesurfaces |26, |26 in engagement with the diagonal portions |28, |28 ofthe webs |30, |30 extending between thetop and Y bottom walls |08 and i0of the bolster within the pocket |06. at eachof the inboard and outboardsides thereofand merging with the respective inboard and outboard wallsH4 and |6, said walls |24 of the shoe ||8 having` engagement withresilient pads |32, |32 seated on the diagonal por-- tions |34, |34'ofthe webs |30,'i30. It may be notedfrom a consideration of Figure 7 thateach of the diagonal portions |28, |28 of each of the Iwebs |30, |30 isrelieved as at |35 to'prevent wearing of shoulders thereon by themovement of the shoes and to allow flow of the associated pad |32 uponinward movement of the shoe along the diagonal portions |28, |28 of thewebs |30, |30. Integrally formed with the walls |22 and |24 of each shoeand projecting laterally therefrom between the webs |30, |30 is thevertical wall |36 in engagement as at |38 with a spring plate |40vulcanized to thek resilient pad |42 which may bear as at |44 againstthe center rib of the bolster,

-vertical expansion of said pad being restricted by its bearing againstthe top and bottom walls of the bolster end, there being some clearanceafforded above and below the pad. The rib is provided with an opening|46 therein permitting the flow of the p ad under compression as well asto permit distortion of the pads at opposite sides of the rib sothat'the pads may bear against each other.

An important feature of the present modification is the formationof therear wall of the shoe H8 in complementary engagement with the springplate |40 as seen in Figures 10, 11 and `12. The 'rear wall ofthe shoeis formed with the spaced faces |50, |50 arcuately curved from top tobottom thereof with the central projecting portion |52 of the wall,intermediate the faces |60,

|60, presenting a face |66 which. is of substantially toric shapeinasmuch as it has a curvature extending vertically over a substantiallygreater radius than the curvature across the same, said faces |60, |60and |66 being in complementary engagement with the spring plate |40.This construction of the rear face of the wall |36 ofthe shoe H0 and thesurface of the plate |40 in engagement therewith allows a padf maximumvolume to be mounted in the pocket of the bolster and thereby permit alarger compression area of the pad to be utilized. Another advantageresides in this construction in that the shoe is positioned in suchmanner that the rubber pad |42 will tend to maintain the shoe in acentral upright position by restricting vertical and lateral movement ofthe shoe in the pocket. j

It will be apparent that in the arrangement described, the pads |32under compression between the shoe and the bolster will tend to urge theshoe outward of the pocket along the diagonal portions |20, of the webs|30, |30 to engage the friction wall |20 of the shoe with the ad jacentcolumn. At the same time, the pad |42 under compression between the shoeand the bolster will constantly urge the shoe outwardly toward theadjacent column and maintain the shoe in full face engagement with thecolumn friction plate irrespective of vertical and horizontal angling ofthe bolster relative to the side frame columns under service conditions.

Each shoe is provided with a horizontal opening |60 therethrough foralignment with openings |62 in the transverse bolster walls by means ofa shoe-positioning pin received within the openings for positioning theshoes in assembled relationship with the bolster whereby the shoe may beforced into the associated pocket to provide sufficient clearance fromthe adjacent side column in the assembly or disassembly of the bolsterwith the side frame.

In the assembly of the friction devices with the bolster, each rubberpad |42 may be inserted within the open end of the bolster between thetop and bottom walls thereof and between the center rib ||2 and theadjacent spaced webs |30' and thereafter the pads |32, |32 may bepositioned on the diagonal portions of the webs |30, in each pocket |06in the bolster.v The shoes may then be inserted in the pockets |06 andurged inwardly along the wedge` surfaces of the diagonal portions |28,|28 of the webs |30, |30 until the opening |62 in each shoe is alignedwith the openings in the inboard and outboard walls' ||4 and ||6whereupon pin means may be inserted within the openings for maintainingthe shoes in a retracted position within the bolster for subsequentassembly of the bolster with the side frames.

It is to be understood that I do not wish to be g limited by the exactembodiments of the device shown 'which are merely by way of illustrationand not limitation as various and other forms of the device will, ofcourse, be apparent to those skilled in the art without departing fromthe spirit of the invention or the scope'oi' the claims.

I claim:

1. In a railway car truck, a side frame having .y

` 6 and a friction face bearing on the adjacent column, and a pluralityof resilient means'associated with each shoe. one of said resilientmeans being compressed between a wall of said shoe and a spaced wall ofsaid bolster and the other of said resilient means being compressedbetween another wall of said shoe and another wall of said bolster,saidresilient means comprising distortable rubber pads respectivelyurging said shoe along said wedge surfaces and outwardly into engagement'with the adjacent column.

2. In a railway car truck, a side frame having spaced columns, a bolstersupported from said frame between said columns, a pocket in each side ofsaid bolster adjacent each column, a friction shoe inteach pocketcomprising a friction surface on one side thereof in engagement with theadjacent column and angularly arranged faces on the opposite sidethereof, one of said faces being in wedge engagement with said bolsterand the other face affording a spring seat, resilient means compressedbetween said spring seat' and a spaced'wall of said bolster, andresilient means compressed between a portion of said shoe projectingfrom' said faces and another wall of said bolster, said resilient meanscomprising distortable resilient pads respectively urging said shoe intosaid wedge engagement and outwardly into engagement with the adjacentcolumn.

3. In a railway car truck, a side frame having spaced columns, a bolstersupported from said frame between said columns and comprising top andbottom walls, a center rib and transverse walls defining a pocket ateach side of said bolster, spaced webs in each pocket at the inboard andoutboard sides thereof each comprising a wedge surface, and a springseat, a shoe in each pocket in engagement with each of said wedgesurfaces, a resilient member compressed between said shoe and each ofsaid seats and operative to urge said shoe along said wedge surfaces,and resilient means between said shoe and a spaced wall of said `bolsterand operative to urge said shoe outwardly into engagement with anadjacent column. v

4. In a railway car truck, a side frame comprising spaced columns, abolster supported from said frame between said columns, a pocket in eachside of said bolstervcomprising spaced inboard and outboard webs eachhaving a wedge surface sloping upwardly toward the adjacent column and aspring seat sloping -downwardly toward the adjacent column, a frictionshoe in each pocket in engagement with said wedge surfaces, resilientmeans compressed between said spring seats and said shoe and operativeto urge said shoealong said surfaces, and resilient means compressedbetween a portion of said shoe extending between said surfaces and aspaced wall of said bolster and urging said shoe outwardly of saidbolster.

5. In a railway car truck, a side frame comprising spaced columns, abolster supported from said frame between said columns, a pocket in eachside of said bolster comprising spaced coplanar inboard and outboardsurfaces and spaced coplanar spring seats, said surfaces and saidl seatsbeing angularly arranged and sloping toward the adjacent column, afriction shoe inl each pocket in engagement with said surfaces and infrictional engagement with the adjacent column, resilient meanscompressed between said shoe and said spring seats urging said shoealong said surfaces, and independent resilient means com- .prisinsspaced pressed between said bolster.

6. In a railway car truck, a side frame comcolumns comprising topv andbottom walls, a center rib and transverse webs dening a pocket in eachside of said bolster adjacent each column, spaced inboard and outboardwedge surfaces in each pocket on one of said walls, a friction shoe ineach pocket in engagement 'with said wedge surfaces, spaced spring seatsin each pocket on the other of said' walls, resilient means com@ saidspring seats and said shoe and urging said independent resilient meanscompressed lbetween said center rib and a portion of said shoe extendingbetween said surfaces and urging said shoeoutwardly of said bolster.

` 1.V In a` railway car truck, a side frame having supported from saidspaced columns. a bolster a pocket in each side frame between saidcolumns,

' of said bolster comprising spaced wedge surfaces sloping upwardlytoward the adjacent column, a friction shoe in each pocket having spacedwedge faces in engagement with said surfaces,

a wall on said shoe intermediate said faces andextending between saidwedge surfaces, a resilient member compressed between said wall and aspaced bolster Wall and operative to urge said shoe outwardly intoengagement with said column, and a resilient pad compressed betweencolumns, a bolster between said shoe along said surfaces, and

another wall of said shoe'and another-.wall of i Vspaced wedge faces inengagement with said surfaces, a wall on said shoe intermediate saidfaces and extending between said surfaces, a resilient member compressedbetween said wall and a spaced bolster wall and operative to urge saidsaid bolster and operative to urger said shoe along said wedge surfaces.

faces and a spaced wall of said bolster and urging said shoeA outwardlyof said bolster.

11. In a railway car truck, a side frame comprising spaced columns.

said frame between said columns, a pocket in said -bolster adjacent eachcolumn, a pair of spaced wedge surfaces in each pocket, a frictionshoein each pocket in engagement with said sur.

faces and engaging the adjacent column, a re-A silient pad compressedbetween said shoe anda spaced wall of said bolster, and a resilientmember compressed between a portion of said shoe extending between saidsurfaces and another wall of said bolster, said resilient pad and memberrespectively urging said shoe along said wedge surfaces and outwardlyinto engagement with the adjacent column.

12. In a' railway car truck, a side frame comprising spaced columns, abolster supported from said frame between said columns, a pocketin eachside of said bolster comprising spaced inboard and outboard webs eachhaving a wedge Asurface sloping upwardly toward they adjacent column anda spring seat sloping downwardly toward the adjacent column, a frictionshoe in each pocket in engagement with said wedgevsur-x faces, andresilient means compressed between saidA spring seats and said shoeurging said shoe along said surfaces and into engagement with theadjacent column. v

13. In a railway car truck, a side frame comprising spaced columns, abolster supported from said frame between said columns, a pocket in saidbolster adjacent each column, a friction shoe in each pocket'havingafriction face on one side I l thereof and diagonally'arranged surfacesonlthe shoe outwardly into engagement with said column, and a resilientmember compressed between the bottom of said shoe and another wall ofsaid bolster. l

.9. In a railway car truck, a side frame having spaced columns, abolster supported from said frame between said columns and having apocket in each side thereof comprising spaced wedge surfaces slopingupwardly toward the adjacent column, a friction shoe in each pocket inengagement with said surfaces and having a wall extending between saidsurfaces, a resilient member compressed between the wall of said shoeand a vertical wall of said bolster and operative to urge said shoeoutwardly into engagement with said column, and a resilient membercompressed between a diagonal wall of said shoe and a diagonal wall ofsaid bolster and operative to urge .said shoe along said wedge surfaces.

opposite side thereof, a resilient -pad compressed between a wall ofsaid bolster and one of said surfaces and operative to urge the other ofsaid surfaces into wedge engagement with another wall of said bolsterand said friction face into engagement with the adjacent column, and ablock of resilient material compressed between a portion of said shoeextending between said surfaces and another wall of said bolster andcomplementing the action of said pad in urging y said friction face intoengagement with the adjacent column, said pad and said block cooperatingwith each other to maintain said shoe in a substantially uprightposition irrespective of any angling of the bolster.

14. In a railway car truck, a side frame com prising spaced columns, abolster supported between said columns, a pocket in each side of saidbolster adjacent each column, each` of said pockets having a wedgesurface and a spring seat spaced therefrom and sloping toward theadjacent column, a friction shoe in each pocket having diagonallyarranged surfaces in engagement with said surface, resilient meanscompressed between said spring seat and said shoe and urging said shoealong said surface and into engagement with the adjacent column, and aAblocl: of resilient material compressed between a portion of said shoeextending between said surfaces and another wall of said bolster forcomplementing the action of said resilient means, said resilient meansand said block cooperating with each other to maintain said shoe in asubin spite of any angling 8 Y and resilient means compressed between aportion of said shoe extending between said sura bolster supportedfromside thereof adjacent each column, a wedge surface in each pocket, afriction shoe with diagonally arranged surfaces in each pocket, aresilient pad compressed between said shoe and a spaced Wall of saidbolster and operative to urge said shoe along said surface and intoengagement with the adjacent column, and another resilient padcompressed between a portion of said shoe extending between saidsurfaces and another wall of said bolster, said pads cooperating witheach other to maintain said shoe in a substantially upright positionirrespective of any angling of the bolster.

16. In a railway car truck, a side frame comprising spaced columns, abolster between said columns having a pocket adjacent each column, awedge surface in said pocket sloping toward the adjacent column, afriction shoe in each l pocket, resilient pads compressed between spacedsurfaces on said shoe and an adjacent wall of said bolster urging saidshoe along said wedge surface and outwardly ofsaid bolster and intofrictional engagement with the adjacent column, a block of resilientmaterial compressed between a portion of said shoe extending betweensaid surfaces and another wall'of said bolstemand complementing theaction of said pads in urging said shoe into engagement with theadjacent column, and an opening in said last-mentioned bolster wall foraccommodating the bulging of said block as it is compressed.

17. In a railway car truck, a side frame comprising a column, a bolsterspring-supported by said frame adjacent said column, said bolstercomprising a pocket containing converging surfaces, a friction shoe insaid pocket, a resilient pad compressed between the shoe and one surfacefor urging the shoe into wedge engagement with the other surface andinto frictional engagement with the column, said other surface beingVrelieved at the inner extremity thereof to' accommodate bulging ofvsaid, pad upon compression thereof. Y

18. Inv a railway car truck, a side frame. comprising a column member, arelatively movable member supported from said frame and having a pocketadjacent said column, a friction shoe in said pocket, and resilient padsrespectively urging said shoe into wedge engagement with said movablemember and outwardly of said lastmentioned member into frictionalengagement with the adjacent column, said pads exerting forcescooperating with each other for maintaining said shoe in a substantiallyupright position in spite of any angling of said movable member.

19. In a railway car truck, a side frame having spaced columns, abolster supported from said frame and having a pocket adjacent each column, friction shoes in said pockets bearing against wedge surfaces onthe bolster, and a plurality of resilient pads compressed between saidshoes and said bolster, urging each shoe into engagement with theadjacent column and cooperating with each other for maintaining saidshoe in a substantially upright position irrespective of any angling ofsaid bolster.

20. In a railway car truck, a side frame comprising a column, a bolsterspring-supported from said frame adjacent said column, a pocket in saidbolster, spaced wedge surfaces on said bolster Within said pocket, afriction shoe engaged with said surfaces and frictionally engaging saidcolumn, a horizontal spring compressed between said shoe and a wall ofsaid bolster for urging said shoe against the column, and a resilientpad compressed between vertically spaced abutment surfaces on said shoeand said bolster respectively for urging said shoe against saidsurfaces. LEO A. LEHRMAN.

REFERENCES CITED The following references are le of this patent:

of record in the.

Light June 19, 19451

